Rhus. AXACAKDIACE.E. 383 



more entire leaves and answer to A', radimns, L. R. verrucosa, Scheele, Linnaa, xxi. 592, 

 the Miesocarp described for tlie surface of tlie drupe. Toximdendron vu/yare, jiuhf.-icetis, criua- 

 titiii,^ volubilis, & sermtnm, Mill. Diet. ed. 8. (Varietie.s indiscrlMiiuate : a Japanese one, coll. 

 Maximowicz, has hisj)idulous fruit !) — Moist or shady ground ; Nova Scotia to Florida, west 

 to Brit. Columhia, Oregon, and Arizona. (Bermuda, Mex., Japan.) 

 R. diversiloba, Toitn. & (Jrav. (Poison Oak, Yk.vui).) Leaflets oldung or oval <.r 

 somewhat oliovate, with rounded or very ol)tusc apex, varying from entire to sul)|iinnatifid 

 (1 to 3 inches long); lateral ones sulisessile : panicles surpassing the petioles not rarelv 

 equalling the leaves : otherwise as tlie j)receiling. — V\. i. 218; Lindl. Bot. Heg. xxxi. t. "J 8; 

 Brew. & Wats. Bot. Calif, i. 110. li. Inhnta, Hook. Fl. Bor.-Am. i. 127, t. 46, not I'oir! 

 A'. Toxicodendrou, var. diversiloba, Engler, 1. c. 395. — Common throughout California, north 

 to the borders of Washington, where probal)ly it passes into the preceding. 

 -»— -t— Leaves pinnate: panicles slender: stems never rooting or climbing. — Vaiinisii 



TREES. 



R. venenata, DC. (Poison Dogwood, Poison Elder, Poison Si'mach.) Arborescent 

 shrul), glabrous, or almost so: leaves 7-13-foliolate, with reddish petiole; leaflets memlirana- 

 ceou.s oblong or oval, acuminate, entire, acute at base and .somewhat ])Ctiolulate, pale 

 beneath, 2 or 3 inches long : ])aniclcs narrow : drupes small, the stone broader than long, 

 obtusely sulcate longitudinally. — Prodr. ii. 68; Hook. Fl. Bor.-Am. i. 126; Torr. & Grav, 

 n. i. 218, 681; Emerson, I.e., with plate; Engler, I.e. 397.- R. Vernix, L. Spec. i. 265,' 

 except as to syn. Kaempf., whence however the name (Dill. Elth. t. 292; Pink. Aim. t. 145, 

 f. 1 ) ; Marsh. Arb. 130 ; Lam. 111. t. 207, f. 2 ; Bigel. Med. Bot. i. 96, t. 10. — Wooded swamps. 

 Northern New England and Canada to Minnesota, south to Georgia^ and W. Louisiana. 



* * Mal6sma, Nutt. Drupes whitish, very small, smooth ; the mesocarp a thin granular- 

 waxy layer without fibres; the ob.scurely didymons stone smooth and bonv : leaves simjde, 

 thin-coriaceous : flowers polygamous, very numerous in an ample terminal panicle : petals 

 slightly imbricated in the bud : plant apparently innocuous. 



R. laurina, Nutt. Shrub, very leafy, evergreen, exhaling odor of l)ittcr almonds : leaves 

 oblong, verging to lanceolate, entire, acute or obtuse, mucronate, jiinnately veinv, 3 or 4 

 inches long, rounded at base, rather long-petioled : flowers very small, white : drupes a line 

 or hardly two lines in diameter. — Nutt. in Torr. & Gray, Fl. i. 219; Brew. & Wats. 1. c. 

 Ill; Engler, I.e. 393. Lithrfpa lanriua, Walp. Rep. i. 551; Torr. Pacif. H. Kep. iv. 7.3, 

 & Bot. Mex. Bound. 44, t. 7. — S. California in valleys near the coast, from Santa Barbara 

 to San Diego 5 and islands; first coll. by Nuttall. 



* * * SiJmac. Drupes red, sour, and the epicarp clothed with acid secreting hairs; 

 the mesocarp thin fleshy and not ceriferous, its delicate fil)res coherent rather witii the 

 epicarj) and freely separating from tlie smooth and even stone : no poisonous qualities, 

 except possibly in A', pumila. — § Sumac in part, & Lobadium (Raf.), DC. Prodr. ii. 67, 72. 

 § Trichocarpre, Engler, 1. c. 376, excl. R. trirhocarpa. 



•§— True Shmachs : leaves pinnately plurifoliolate, deciduous or iu one species subpersist- 

 ent, the leaflets se.ssile : polygamous (or dioecious) flowers and crimson fruit in a dense 

 and sessile terminal thyrsus or with smaller ones in axils of uppermost leaves ; bracts 

 minute, thin and deciduous: erect shrubs or small trees, with large leaves and stout 

 branches, orange or yellow wood, bark and especially foliage astringent (rich in tannin) 

 and used in tanning ; fl. summer. 



++ Rhachis between the leaflets naked. 



its smaller thicker less pubescent leaflets, — distinctions of doubtful value in a plant .«o near the widely 

 distributed and polymorphous R. Toxicodendron. Similar specimens from W. Florida, Eugtl, and 

 Texas, Lindheimer, are in some regards transitions to the typical form. 



1 T. crenntum. Mill. 1. c., probably was R. Canadensis, Marsh. 



'•i Add Millspaugh, Med. Pi. i. .37, t. 37. 



8 Add Sargent, 1. c. 2-3, t. 107, 108. 



* Florida, Ruf/el. 



6 Also extending far southward into I^wcr Calif., arc. to Rr.indegee. 



